EP 0361904 A2 19900404 - Turbidity meter.
Title (en)
Turbidity meter.
Title (de)
Trübungsmessinstrument.
Title (fr)
Instrument de mesure de turbidité.
Publication
Application
Priority
CA 579077 A 19880930
Abstract (en)
A turbidity meter has a sensor unit (8) supported in a fluid under test with a light source (10) and at least two light sensors (12, 14) supported so that one light sensor(12) is in line with the source to receive transmitted light and the remaining sensor (14) or sensors are arranged to receive light scattered by the fluid. Both the source and the sensors have flow forming chambers (44) connected to a source (18) of pressurized fluid so that a thin layer of this fluid is caused to flow over lenses (42) of the source and sensors to prevent deposition of material from the fluid under test. The signals from the sensors are digitized, and the intensity of the source is digitally controlled to maintain at least one of sensor signals within a suitable range, thus enabling operation over a wide range of turbidities, and automatic selection of turbidimetric and nephelometric modes of operation as appropriate.
IPC 1-7
IPC 8 full level
G01N 15/06 (2006.01); G01N 21/53 (2006.01); G01N 21/85 (2006.01)
CPC (source: EP KR US)
G01N 21/00 (2013.01 - KR); G01N 21/532 (2013.01 - EP US); G01N 21/8507 (2013.01 - EP US); G01N 2201/0621 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0361904 A2 19900404; EP 0361904 A3 19910206; AU 4231789 A 19900405; CA 1311625 C 19921222; JP H02168139 A 19900628; KR 900005167 A 19900413; US 4999514 A 19910312
DOCDB simple family (application)
EP 89309854 A 19890927; AU 4231789 A 19890927; CA 579077 A 19880930; JP 25249689 A 19890929; KR 890013988 A 19890929; US 41460989 A 19890928